I applied for Delta Gold amex card last november. This is my sign up bonus confirmed with couple of reps by calling amex.

15,000 after first purchase
10,000 after $1000 purchases in 3 months

I made my first purchase on 11/29/2010 and received only 10K instead of 15k. And also fulfilled the $1000 purchases with the statement ended on Feb 4th and no bonus miles credited so far. I mailed AMEX and received standard response saying 'it takes 4-8 weeks'.

I don't want to sound like impatient, but just trying to understand Delta timelines in crediting bonus miles. Thanks.